1. Turn off the power to the furnace. This can usually be done by flipping a circuit breaker or by unplugging the furnace from the outlet.
2. Remove the access panel to the furnace. This is typically located on the front or side of the furnace.
3. Locate the limit switch. The limit switch is a small, metal device with two terminals. It is usually located near the burner assembly.
4. Disconnect the wires from the limit switch. Use a screwdriver to loosen the screws that hold the wires in place.
5. Remove the limit switch. Use a wrench to loosen the nuts that hold the limit switch in place.
6. Inspect the limit switch for damage. Look for any cracks or breaks in the housing or any loose or damaged wires.
7. Clean the limit switch. Use a soft cloth to wipe away any dirt or debris that may have accumulated on the switch.
8. Reinstall the limit switch. Insert the limit switch into the mounting bracket and tighten the nuts.
9. Reconnect the wires to the limit switch. Tighten the screws that hold the wires in place.
10. Test the limit switch. Turn on the power to the furnace and make sure that it is functioning properly.
If you are uncomfortable repairing the limit switch yourself, you can contact a qualified HVAC technician to do the job for you.
